Emma Webber told GB News it "sickens her to her very core" that serious criminals can manipulate the mental health system to avoid proper punishment.
The mother, who lost her son Barnaby Webber in the Nottingham attacks, reacted to the staggering new figures that show at least 30 dangerous mental health patients have gone on to kill after being secretly freed from high security institutions in recent years.
Mrs Webber said: “It’s absolute rubbish. It’s misleading at best, immoral and repugnant at worst."
GB News host Martin Daubney said: "Some of the other figures are just as alarming 90 per cent are released within ten years and 99 per cent within 20 years.
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"You’ve spoken passionately today about your fears that Valdo Calocane could be released early, particularly as you’ve heard he is responding well to treatment in the psychiatric unit.
"It must be utterly unfathomable and grotesque to you to even contemplate that possibility."
She responded: "It sickens me to my very core. And I know we are not the only tragic victims who have faced something like this.
"What we do have is a voice. We have public and media awareness, and we have a statutory public inquiry coming up.
Emma Webber shared her reaction to the staggering new figures
|GB NEWS
"We have to use that, and we have to use our pain to make the public aware. This is a huge risk and a huge failure of our system.
"The thought of this monster being back out is unbearable.
"In a worst-case scenario, he would be released at the same age I was when he brutally murdered my child. That is the reality of what lies ahead."
"Hospitals and doctors have a right to treat, but they do not have a right to detain and punish.
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Valdo Calocane was given an indefinite hospital order in January after pleading guilty to manslaughter | GB News"So if he is responding well to treatment, how can they keep him in despite what we are told so publicly in court?
"I’ve run out of words, Martin. I think I’ve made my point clear."
Calocane, who carried out the crazed attack, admitted manslaughter on the grounds of diminished responsibility.
He was handed an indefinite hospital order and told it was unlikely that he would ever be released.
New data obtained by The Telegraph reveals that 55 per cent of offenders sent to secure hospitals are released within five years, rising to nearly 90 per cent within a decade and 99 per cent within 20 years.
Between 1993 and 2019, 30 high-risk mental health patients released from secure facilities went on to commit further killings.
Under the current system, patients who are judged to be responding well to treatment can apply for release, even while being held in secure conditions.
Each year, around 500 patients are quietly discharged from high- or medium-security mental health institutions.
Those seeking release appear before an independent mental health tribunal, typically made up of a three-person panel.
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